Mar 12, 2013byAbramowitz, Milton (editor); Stegun, Irena A. (editor)
"Trivia question: What is the most cited work in the mathematical literature? With an estimated 40,000 citations, the Handbook of Mathematical Functions may well be it. Edited by Milton Abramowitz and Irene Stegun and released by the National Bureau of Standards in 1964, the Handbook was the result of a ten-year project to compile essential information on the special functions of applied mathematics (e.g., Bessel functions, hypergeometric functions, and orthogonal polynomials) for use in... ( 1 reviews ) Topics: Functions, Mathematics--Tables
Gives data on the change in the electrical conductivity of MoS/sub 2/, when exposed to radiations of wave-lengths between 360 and 9000 ??. An effect on the conductivity is produced by wave-lengths below 3000 ??. Increasing intensity of the light leads to a more rapid response to the longer waves. At room temperatures there are maxima of sensitiveness at 700, 850, 1020, and 1800 ??. These decrease rapidly on heating, and nearly disappear at 80°C. At -178°C. the whole sensitiveness is higher,...
A study of the durability of roofing made with Asplund wood fibers was conducted from 1942 to 1967.Concentrations of 0 to 60 percent wood fibers (oak or pine) prepared by three variations of the Asplund process were evaluated.All the mineral-surfaced roll Topics: Roofing, Bituminous., Felt.
The passage from electrical super-conductivity to normal conductivity of metals at low temperatures may be attained with a critical current density or by the application of a critical magnetic field. The author regards these two means as interdependent. In a previous paper the case of a wire conveying a current was treated and the magnetic field resulting was such as to give rise to a central superconducting core with an outer resisting layer. This condition is unstable. The present note... Topics: electrical conductivity, temperatures (high and low), Condensed matter, electronic structure,...
The luminosity of a radiator is defined as the integral from O to infinity with respect to lambda of the product of visibility (V) and energy (J) of the radiating source, /b i,e./ int /sub 0//sup infinity / VJ/b d/ lambda V = /b f/( lambda ) is given by the experimental determinations of Ives, Nutting, and Hyde and Forsythe, and J = /b c/sub 1// lambda /sup -5//b e//sup -c//sub 2//sup lambda thetas / (Wien's law). The effective wave-length lambda L of the luminosity has been defined... Topics: photometry, rays and radiation, temperature, Heat flow, thermal and thermodynamic processes
The substance whose thermal expansibility is required is used as a pillar to support a glass plate. The other side of the plate is supported by some standard substance, such as glass, quartz, or metal, of known expansibility. When temperature rises there is a differential expansion between the pillar and the standard substance. This expansion produces a movement of the interference fringes formed in the usual way between the glass plate and the surface of the standard. The peculiarity of the...
This paper contains a theoretical investigation into polarimetric instruments and methods, and deals, amongst other points, with the conditions for maximum sensibility and accuracy. The author shows that unsymmetrical sources, especially double unsymmetrical sources like the sodium lines, should be avoided. Topic: measurements and use of instruments
-byScribner, Bourdon F. (Bourdon Francis), 1910- (editor)
In optical spectrometry, studies were made of the effectiveness of a liquid Q-switch for laser pulse control and the applicability of the high-frequency plasma torch in atomic emission and absorption spectroscopy. In electron probe microanalysis an align
Further investigations by the Bureau of Standards on the effects of frosting incandescent lamps are described. The results of frosting are classified under three general heads: (1) Change in absorption, (2) change in distribution, and (3) change in life. The lamps were seasoned, and the mean spherical c.p. of 25 lamps of each type was measured. They were then sent to the factory to be frosted, and when they came back their c.p. was measured again. The loss of light is probably due to absorption... Topics: alternators, lamps and lighting/ B8530B Light sources
Describes measurements of the magnetic properties of a series of specimens of these alloys together with measurements of the magnetostriction and of the effect of a magnetic field on the thermo-electric properties. Attempts were also made to measure the mechanical properties (Young's modulus) of the alloys, but all the specimens behaved very erratically and several broke at low loads on account of internal flaws, so that the authors are unable to say more than that Young's modulus is high.... Topics: magnetism, Magnetic properties and materials
Universal Ratio Sets can be calibrated by a number of different methods. The well established methods are very briefly outlined and emphasis is placed on some more recent developments. The choice of methods will depend upon available laboratory equipment Topics: Measuring instruments., Calibration.
This paper discusses the arc spectra and critical potentials of arsenic, antimony, and bismuth, revised values of the critical potentials being given, while information on the spectrum of singly ionised nitrogen and the various spark spectra of bismuth is included. The resonance potentials of the neutral atoms are found to correspond to the mean excitation voltages of groups of spectra lines. Photographs of the thermionic discharge in bismuth were used to separate the excitation stages of the...
A survey of the literature on evaluation of information systems was conducted.During the early stages of the survey, the literature was divided among descriptions of programs which compared the performance of two or more information systems, accounts of p Topic: Information storage and retrieval systems--Bibliography.
The object of the investigation was to establish a quantitative relationship between stress and magnetic properties. Using high magnetic fields and the relationship rho = alpha beta H where rho = metallic reluctivity and alpha and beta characteristic constants for the material, ballistic observations were made on steel wire over the region H = 100 to 800 and tensions from 0-102,000 lbs./sq. in. It is found that tension causes a departure from the linear relationship. The reluctivity curve for...
The method consists in producing simultaneously on a moving photographic film a record of the occurrence of the events under consideration and timing lines from a tuning fork acting as a shutter. This shutter consists of two opaque vanes, in which narrow slits have been cut, mounted on the prongs of a tuning fork, so that the slits are parallel to the axis of the fork, and coincide when the fork is at rest. When the fork vibrates the two slits will coincide twice during each complete period of...